body {
  padding: 0px;
  margin: 0px;
}
ul,li{
  padding: 0px;
  margin: 0px;
  list-style-type: none;
}
.mainDiv {
  display: flex;
  width: 100%;
}
a{
  text-decoration: none;
}
.leftNav {
  width: 16%;
  background-color: #c0c0c0;
  color: #333;
  font-size: 24px;
  height: 1000px;
  padding: 20px;
}
.leftNav a{
  font-size: 16px
}
.rightMain {
  flex:1;
  padding-left:20px;
  height: 1000px;
  background-color: #fff;
  font-size: 20px;

}
.rightMain .right .subNav{
   background: #cfdefd;
}
.rightMain .subNav li{
  height: 40px;
  line-height: 40px;
  padding:0 10px;
  display: inline-block
}
.rightMain .right h3{
  margin:0;
  height: 60px;
  line-height: 60px
}